Tankless Coil Water Heater
Buying Tips

Take advantage of using tankless coil water heater when
utilizing hydronic boiler, gas or oil-fired furnace for home heating.
Check out the tips on buying the tankless coil systems for residential
heating, pros and cons.

Tankless
coil water heater is designed to perform as the heat
exchanger to
heat domestic water.
Tankless
coil unit has a coil type heat exchanger as part of the
main heating system, and it is found in
oil-fired and gas fired boilers or furnaces.

Coils are immersed in the hydronic boiler. The purpose is to
transfer the heat from the boiler's hot water to the water that is
running through the tankless coil exchanger and further to
the tap.

Tankless coil devices are designed to provide an optimal heat
transfer.
If the cold
water flows too quickly through the coil the result is the lower
outgoing hot water temperature. By installing a flow regulating valve
on the incoming cold supply you can regulate this temperature.

Tankless coil water heaters are integrated and combined
systems,
installed in the home space heating system that are using a hydronic
boilers and for the tank-less heating needs, while
saving money on the total installation cost.

Pros
and Cons

Tankless coil
system advantage is the
absence of the storage tank and no stand-by heat loss, eliminating the need of purchasing a separate heating
system and resulting in money savings. Water is heated on demand, as it flows through the heat
exchanger whenever the hot tap is open. Tankless coil can
also work as
the supplemental heater.

Home heating has to work to be able to produce the hot water.
This is
the main drawback, as the system is less
efficient during the summer when space heating is not required. If
there are colder days during the year, home heating is more
used
and water heating is more efficient.

This is why tankless coil water heaters are primarily seen in
cooler climates.

To help tankless coil water heaters to overcome problems with
the low
efficiency during the warmer months, the coil system
is combined with
the storage tank. Now, the whole system has to be upgraded with the
pump and other controls. The boiler will not operate all the time, only
when there is a call from the thermostat for heating.

The pump will run the cooler water near the bottom of the
storage tank
through the tankless coil and moved to the top of the storage tank
providing a stable temperature. The circulation
will stop when the temperature on the thermostat is satisfied.

One of the reviews or studies done by " Consumer Guide to Home
Energy
Savings" is that in non-winter months, tankless coil water heaters can
consume three BTU's of fuel for every one BTU of hot water these units
provide.

Problems
and how to solve them

If you notice that the flow is lower than usual, mineral
deposits
or rust might have built up in the coil exchanger. This is one of the
frequent problems as the tankless coils are built from the small size
pipes, which are subjected to clogging. To avoid further problems the
unit needs to be flushed.

Use white vinegar, citric acid or any other available
solution for the heat exchangers, and pump it through the tankless
coil, to flush out mineral deposits. It is important to have the
isolation valves installed, to isolate it from the potable water
supply.
This is not a simple DIY project, the project needs a
specialized
pump, so the recommendation is to call a plumber.

If the coil leaks you might have potable water contaminated with
the
boiler water, or even worse it might damage the boiler. Leaks are
caused due to the failed connection in the coil tubing or where it
joins the plumbing. The pressure and the amount of hot water will be
reduced.

Mineral deposits and improperly adjusted mixing valve can be
the cause
for the insufficient hot water production.

According to the above overview of the tankless coil water heaters,
these systems work great during the winter time when taking advantage
of the home heating, but due to its inefficiency during the warmer
days, and
other
problems, conclusion is that this is not a preferable way for water
heating.

By Application

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